“Conduent’s pattern of mismanaging cashless toll systems is deeply troubling and warrants further scrutiny,” the letter reads. “If drivers are being hurt financially, the FTC should hold the company accountable and prevent it from doing further harm.”

Conduent began managing SunPass in 2015 when it signed a seven-year $287 million contract with the state. Problems arose last month when the company pushed through an upgrade and the system stopped charging drivers’ accounts when they used toll roads. At one point, there were 170 million unprocessed charges.

In a release on Monday afternoon, the Florida Department of Transportation said that it is seeing improvements and more than 158 million transactions have been processed as of July 29. Still, the state said the total backlog of transactions is 152 million.

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Florida Democratic lawmakers want the state to suspend all SunPass toll collections as the system responds to a backlog of more than 100 million unprocessed payments.

State Rep. Kionne McGhee will join state Sen. Annette Taddeo and other local officials Wednesday in also calling on Gov. Rick Scott to create an independent auditing committee to investigate the backlog and other customer service complaints.